I have, for quite a while, provided modified versions of the code for my projects free of charge. However, the cost of webhosting for this site has tripled in the last couple of years and the little I make out of the pcbs I sell goes nowhere near covering this cost.
As of October 2017, I will be asking for a donation in exchange for providing custom modified code for my projects to help keep this site available.
A modification plus software to allow the Simple DDS VFO to be re-calibrated as often as you want without having to re-program the PIC has been added to the Simple DDS VFO page. Simple DDS VFO bug problem fixed. Code uploaded to webpage as version 'c'.
There is a bug in the Simple DDS VFO code. See Simple DDS VFO page for the problem and updated code. Included an add-on for the Simple VFO project to indicate which step size has been selected. Simple DDS VFO project updated and software file uploaded. The pushbutton on the encoder is used to change step size (step sizes 10Hz, 1kHz and 10kHz).
Noise Canceller kits now available.
Updated both the DDS Xtal Substitute and DDS Xtal Substitute Mark 2 projects into one project. The original webpages are available to download as PDF's.
New project added - my version of the X-Phase noise canceller. PCB available and a kit of parts to follow soon
Daniel F5ITU:- "I just finished the adaptation of your software to "Simple DDS VFO" for my personal use. It works well and I will soon install it on my "DC receiver". So, now I have a VFO (10Hz step) and which performs a 600 Hz shift when it receives a transmission command on GPIO-3. In addition, I added to the printed circuit, an amp to increase the output level so I can get the necessary 7dBm the SLB-1 RX." Daniel kindly sent these images of the changes to the code, along with his actual ASM file as well as his Sprint layout file for his pcb. You can find them at the end of the page. Because the following images may be a little hard to read, I have put them in a zip file you can download, also at the bottom of the page. Daniels code file. PIC12F629-08.asm And his PCB layout. See the PCB Info page for information on using this file. DDS_Dan-1.lay6 The coding images from above. F5ITU.zip